从shell脚本执行shell命令，如果出现错误，则不停止。

In a sort of try/catch form I want to execute a bash that doesn't stop if an error occurs.

在某种try/catch表单中，我希望执行一个在发生错误时不会停止的bash。

The specific bash is:

具体的bash是:

#!/bin/sh

invoke-rc.d tomcat stop

rm -fr /var/webapps/
cp -R $WEBAPP /var/webapps/
invoke-rc.d tomcat start

I want to exec "invoke-rc.d tomcat stop" and even if Tomcat is not running, continue to execute the other bash commands.

我想执行“发票管理”。即使tomcat没有运行，也要继续执行其他bash命令。

5 个解决方案

#1

Try:

试一试:

invoke-rc.d tomcat stop > /dev/null 2>&1 || true

A little background:

一点背景:

user@tower: # true
user@tower: # echo $?
0
user@tower: # false
user@tower: # echo $?
1

user@tower: # which true
/bin/true
user@tower: # which false
/bin/false

The real solution is looking at the tomcat init script to see how it knows if tomcat is running :) That way, you don't pester it needlessly.

真正的解决方案是查看tomcat init脚本，看看它如何知道tomcat是否正在运行:)这样，您就不必不必要地纠缠它了。

See this post on the other suggestion to unset / set +e. While it would solve your immediate problem, you may find that you need the recently unset behavior in your own script, especially since you are copying files.

请参阅这篇关于未设置/设置+e的建议。虽然它可以解决您当前的问题，但是您可能会发现您需要在自己的脚本中使用最近的未设置行为，特别是因为您正在复制文件。

This is one of the biggest reasons why true and false were made, other than making Makefiles behave as expected in a variety of build environments.

除了让makefile在各种构建环境中按照预期的方式运行之外，这也是为什么要创建true和false的最大原因之一。

Also, set +e is not entirely portable, i.e. some versions of Solaris (and even Dash) .. but I doubt that this is a concern for you.

此外，set +e并不是完全可移植的，例如Solaris(甚至Dash)的一些版本。但我怀疑这不是你的问题。

#2

Disable the "exit immediately" option with set +e, run your command, then optionally re-enable it with set -e:

使用set +e禁用“立即退出”选项，运行您的命令，然后可选地使用set -e重新启用它:

set +e
invoke-rc.d tomcat stop
set -e  # optional

See section 4.3.1 of the Bash manual for an explanation of the set builtin and all of its various options (of which there are many).

参见Bash手册第4.3.1节，了解关于set build和它的所有各种选项(其中有许多选项)的解释。

#3

Use bash's set command to temporarily disable exit-on-nonzero behaviour.

使用bash的set命令临时禁用异常-非零行为。

set +e
invoke-rc.d tomcat stop
set -e

#4

If invoke-rc.d tomcat stop is the only thing you want to protect against failing, maybe invoke-rc.d tomcat stop || true may do it? That should never have a non-zero exit status.

如果invoke-rc。d tomcat停止是惟一希望防止失败的东西，可能是invoke-rc。d tomcat停止||真的可以做吗?不应该有非零的退出状态。

#5

-3

Try redirecting the standard error to a file ...something like 2> myerror.

尝试将标准错误重定向到一个文件……2 > myerror。

#1